[Patch] Fix libstdc++/9182

[Paolo Carlini]

Pétur Runólfsson wrote:

>Does this handle the case when the first call to __cvt.out() in
>_M_convert_to_external returns partial and the second call returns
>error?
>
The below deals with this corner case too: _M_convert_to external has
to be modified to set __elen = 0 in that case.

In fact, I have to thank you, since in this way, the value of checking
for __elen in two different places in _M_really_overflow is increased.

Paolo.

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